The purpose of this study was to compare the determinants of physical activity of the older adults with and without the experience of falling according to the extended health belief model. A cross-sectional design with correlational strategy was used in this study. The statistical population consisted of male and female older adults ≥ 65 years (79.16±7.92) in Mazandaran province, who were selected based on the multi-stage random cluster sampling method, including of 700 participants, who demographic, history of falls, quality of life, extended health belief model and physical activity questionnaires completed online. After excluding 140 respondents based on exclusion criteria, data were analyzed using Chi-square, one-way ANOVA, Pearson correlation and structural equation modeling. The Results showed that physical activity have a positive relationship with self-efficacy, cues and perceived benefits. In individual with a history of falls, as the severity of the injury increased, the average physical activity and self-efficacy decreased and had less intention to engage in physical activity. This model supported the cues for predicting physical activity habit. Perceived barriers as the most important predictors deterred the intention of physical activity in individual with and without a history of falls, and it is suggested to design interventions to reduce or eliminate those. Moreover, it is necessary to development interventions to improve the knowledge and attitude towards physical activity along with providing a safe environment to participate of the older adults in physical activity.